<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="cart in  ShopGetCartList" :key="cart.skuId">
          <li class="cart-list-con1">
            <input :checked="cart.isChecked===1?true:false" @input="arctItemChecked(cart.skuId,$event.target.checked)"
                   type="checkbox"
                   name="chk_list">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg">{{ cart.skuName }}</div>
          </li>
          <li class="cart-list-con3">
            <div class="item-txt">语音升级款</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ cart.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a @click="changeNum(cart.skuId,cart.skuNum-1)" class="mins">-</a>
            <input autocomplete="off" type="text" :value="cart.skuNum" minnum="1" class="itxt">
            <a @click="changeNum(cart.skuId,cart.skuNum+1)" class="plus">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cart.skuPrice * cart.skuNum }}</span>
          </li>
          <li class="cart-list-con7">
            <a @click="deleteCart(cart.skuId)" class="sindelet">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input v-model="isCheckedAll" class="chooseAll" type="checkbox">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteCartCheckedAll">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{ cartAllNum }}</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ cartAllPrice }}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn" @click="$router.push('/Trade')">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {
  reqDeleteCart,
  reqGetCartList,
  reqGetCheckedCart,
  reqPostAddToCart,
  reqPostBatchCheckCart,
  reqPostBatchDeleteCart
} from "@/api";

export default {
  name: 'ShopCart',
  data() {
    return {
      ShopGetCartList: []
    }
  },
  mounted() {
    this.getCartList()
  }
  ,
  methods: {
    async getCartList() {
      const result = await reqGetCartList()
      this.ShopGetCartList = result[0]?.cartInfoList
    },
    // 1- 修改商品数量
    async changeNum(skuId, skuNum) {
      // 判断是否小余1
      if (skuNum < 1) return
      // 因为后台需要的是加减的插值 但是我们给的是已经计算的好的
      // 所以这里需要计算出差值交给后端
      // 计算出差值 看是增加还是减少
      const num = this.ShopGetCartList.find(item => item.skuId === skuId).skuNum  // 最新的商品数量
      try {
        await reqPostAddToCart(skuId, skuNum - num)
        // 请求成功重新更新数据渲染页面
        this.getCartList();
      } catch (e) {
        alert(e.message)
      }
    },
    // 2- 删除单个商品
    async deleteCart(skuId) {
      try {
        await reqDeleteCart(skuId)
        // 请求成功重新更新数据渲染页面
        this.getCartList();
      } catch (e) {
        alert(e.message)
      }
    },
    // 3- 修改单个商品的选中状态
    async arctItemChecked(skuId, isChecked) {
      try {
        await reqGetCheckedCart(skuId, isChecked ? 1 : 0)
        // 请求成功重新更新数据渲染页面
        this.getCartList();
      } catch (e) {
        alert(e.message)
      }
    },
    // 4- 删除所有购物车已选中的商品
    async deleteCartCheckedAll() {
      // 获取满足条件的id
      const skuIdList = this.ShopGetCartList?.reduce((pre, curr) => {
        curr.isChecked === 1 ? pre.push(curr.skuId) : ''
        return pre
      }, [])
      try {
        await reqPostBatchDeleteCart(skuIdList);
        // 请求成功重新更新数据渲染页面
        this.getCartList()
      } catch (e) {
        alert(e.message)
      }
    }
  },
  computed: {
    // 计算已经选中的数量
    cartAllNum() {
      return this.ShopGetCartList?.reduce((pre, curr) => {
        if (curr.isChecked) pre += curr.skuNum
        return pre
      }, 0)
    },
    // 计算已经选中的商品的总价格
    cartAllPrice() {
      return this.ShopGetCartList?.reduce((pre, curr) => {
        if (curr.isChecked) pre += curr.skuPrice
        return pre
      }, 0)
    },
    // 计算是否全部选中 并设置数据
    isCheckedAll: {
      get() {
        return this.ShopGetCartList?.every(item => item.isChecked === 1)
      },
      async set(isChecked) {
        const skuIdList = this.ShopGetCartList?.map(item => item.skuId);
        try {
          await reqPostBatchCheckCart(isChecked ? 1 : 0, skuIdList)
          // 请求成功重新更新数据渲染页面
          this.getCartList()
        } catch (e) {
          alert(e.message)
        }
      }
    }
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 4.1667%;
        }

        .cart-list-con2 {
          width: 25%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 20.8333%;

          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 12.5%;

        }

        .cart-list-con5 {
          width: 12.5%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 12.5%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 12.5%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>